TIDUF25 june   2023 ADS131M08 , MSPM0G1507

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 End Equipment
    2. 1.2 Electricity Meter
    3. 1.3 Power Quality Meter, Power Quality Analyzer
    4. 1.4 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 External Supply Voltage Supervisor (SVS) With TPS3840
      2. 2.2.2 Magnetic Tamper Detection With TMAG5273 Linear 3D Hall-Effect Sensor
      3. 2.2.3 Analog Inputs
        1. 2.2.3.1 Voltage Measurement Analog Front End
        2. 2.2.3.2 Current Measurement Analog Front End
    3. 2.3 Highlighted Products
      1. 2.3.1  ADS131M08
      2. 2.3.2  MSPM0G3507
      3. 2.3.3  MSP430FR4131 for Driving Segmented LCD Displays
      4. 2.3.4  TPS3840
      5. 2.3.5  THVD1400
      6. 2.3.6  ISO6731
      7. 2.3.7  ISO6720
      8. 2.3.8  TRS3232E
      9. 2.3.9  TPS709
      10. 2.3.10 TMAG5273
  9. 3System Design Theory
    1. 3.1  How to Implement Software for Metrology Testing
    2. 3.2  Clocking System
    3. 3.3  UART Setup for GUI Communication
    4. 3.4  Real-Time Clock (RTC)
    5. 3.5  LCD Controller in MSP430FR4131
    6. 3.6  Direct Memory Access (DMA)
    7. 3.7  ADC Setup
    8. 3.8  Foreground Process
      1. 3.8.1 Formulas
    9. 3.9  Background Process
    10. 3.10 Software Function per_sample_dsp()
      1. 3.10.1 Voltage and Current Signals
      2. 3.10.2 Frequency Measurement and Cycle Tracking
    11. 3.11 LED Pulse Generation
    12. 3.12 Phase Compensation
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Required Hardware and Software
      1. 4.1.1 Hardware
      2. 4.1.2 Cautions and Warnings
    2. 4.2 Test Setup
      1. 4.2.1  Connecting the TIDA-010243 to the Metering Test Equipment
      2. 4.2.2  Power Supply Options and Jumper Settings
      3. 4.2.3  Electricity Meter Metrology Accuracy Testing
      4. 4.2.4  Viewing Metrology Readings and Calibration
        1. 4.2.4.1 Viewing Results From LCD
        2. 4.2.4.2 Calibrating and Viewing Results From PC
      5. 4.2.5  Calibration and FLASH Settings for MSPM0+ MCU
      6. 4.2.6  Gain Calibration
      7. 4.2.7  Voltage and Current Gain Calibration
      8. 4.2.8  Active Power Gain Calibration
      9. 4.2.9  Offset Calibration
      10. 4.2.10 Phase Calibration
      11. 4.2.11 Software Code Example
    3. 4.3 Test Results
      1. 4.3.1 SVS Functionality Testing
      2. 4.3.2 Electricity Meter Metrology Accuracy Results
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
      4. 5.1.4 Layout Prints
      5. 5.1.5 Gerber Files
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

4.3.2 Electricity Meter Metrology Accuracy Results

For the following test results, gain and phase calibration are applied to the meter. In the following results, the active energy results are within 0.1% at 0° phase shift. Additionally, the active energy versus voltage results and the RMS voltage results show that good accuracy results are able to be obtained despite using only a fraction of the ADC range for the voltage channels.

The "% Error" columns in the following 6 tables and plots are calculated as the difference between the multiple reference input values to TIDA-010243 and the measured values, shown on the PC GUI. The reference input values to TIDA-010243 are generated by a PTS3.3C Source Generator/Reference Meter from the company MTE, while the measured values calculated by the TIDA-010243 Energy Library are reported in the PC GUI.

Table 4-3 Phase A RMS Voltage % Error Versus Voltage, 3-Phase Mode
VOLTAGE (V)% ERROR
2700.00555
2600.00384
2400.00375
2300.01086
2200.00863
2000.00700
1800.01055
1600.00250
1400.00214
1200.00666
1000.00300
900.01300
700.01571
500.00240
300.01200
100.00299
90.02733
GUID-20230621-SS0I-B5RC-NZ1D-PTD6SP3VPWQS-low.svg Figure 4-11 Phase A RMS Voltage % Error Versus Voltage, 3-Phase Mode
Table 4-4 Phase A RMS Current % Error Versus Current, 3-Phase Mode
CURRENT (A)% ERROR

0.01

0.50383

0.03

0.20413

0.05

0.07749

0.1

0.00399

0.25

0.02239

0.50

0.00179

1.00

0.01999

2.00

0.01649

5.00

0.00539

10.00

0.00999

20.00

0.01449

30.00

0.03366

40.00

0.01124

50.00

0.01398

60.00

0.01566

70.00

0.00642

80.00

0.00749

90.00

0.02321

100.00

0.02099

GUID-20230621-SS0I-KVZF-VV5C-PWPSQLB5WSZQ-low.svg Figure 4-12 Phase A RMS Current % Error Versus Current, 3-Phase Mode
Table 4-5 Phase B RMS Voltage % Error Versus Voltage, 3-Phase Mode
VOLTAGE (V)% ERROR

270

0.01444

260

0.01307

240

0.00500

230

0.00304

220

0.01090

200

0.00500

180

0.00111

160

0.00687

140

0.00428

120

0.01916

100

0.00900

90

0.00922

70

0.02771

50

0.02240

30

0.02500

10

0.03400

9

0.02133

GUID-20230621-SS0I-PWL1-BDLM-B4LPHKQQQTXF-low.svg Figure 4-13 Phase B RMS Voltage % Error Versus Voltage, 3-Phase Mode
Table 4-6 Phase B RMS Current % Error Versus Current, 3-Phase Mode
CURRENT (A) % ERROR

0.01

0.63311

0.03

0.26816
0.05

0.07893

0.10

 0.04498
0.25

0.01159
0.50 0.01220
1.00 0.01499
2.00

0.00449
5.00 0.01339
10.00

0.00100
20.00

0.01449
30.00 0.02666
40.00

0.02825
50.00

0.01019
60.00 0.01683
70.00 0.00414
80.00. 0.00475
90.00 0.01988
100.00 0.03199
GUID-20230621-SS0I-HFCN-DGNV-HNGN89RXNKCZ-low.svg Figure 4-14 Phase B RMS Current % Error Versus Current, 3-Phase Mode
Table 4-7 Phase C RMS Voltage % Error Versus Voltage, 3-Phase Mode
VOLTAGE (V)% ERROR
90.02077
100.00699
300.00566
500.00960
700.00528
900.00988
1000.00200
1200.00999
1400.00071
1600.01874
1800.00388
2000.00650
2200.00090
2300.01652
240.0.01124
2600.02461
2700.02444
GUID-20230621-SS0I-7KKW-3P4Q-JNPP4VPQDHQJ-low.svg Figure 4-15 Phase C RMS Voltage % Error Versus Voltage, 3-Phase Mode
Table 4-8 Phase C RMS Current % Error Versus Current, 3-Phase Mode
CURRENT (A)% ERROR
0.010.32617

0.03

0.15916

0.050.09126

0.10

0.00499

0.25

0.00200

0.50

0.01940

1.00

0.00500

2.00

0.00699

5.000.01139
10.000.09506
20.00

0.05700

30.00

0.02899

40.00

0.03625

50.00

0.01720

60.000.01166
70.00

0.01842

80.00.0.01062
90.000.00100
100.000.00120
GUID-20230621-SS0I-KCCW-0TJB-ZXFGXKFF5RFV-low.svg Figure 4-16 Phase C RMS Current % Error Versus Current, 3-Phase Mode